单项选择题

（）in 1943 （）the harmful smog made its appearance in Los Angeles.

A．Only；that
B．It was；then
C．That it was；when
D．It was；that

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单项选择题
Though the long-term （）cannot be predicted, the project has been approved by the committee.

A．affect
B．effort
C．effect
D．afford
单项选择题
It took her several years to （）the habit of wild rabbits.

A．care
B．cultivate
C．look
D．observe
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